code: def test_invalid_shape_gpu(self):
      self.x.to_gpu()
      with self.assertRaises(self.error):
          functions.maxout(self.x, self.pool_size)
  
file_path: chainer/tests/chainer_tests/functions_tests/activation_tests/test_maxout.py
imports: import unittest
  import numpy
  import chainer
  from chainer import functions
  from chainer import testing
  from chainer.testing import attr
  from chainer.utils import type_check
label_desc: Use image node_id 3 for calling the InvalidArgument obj's underlying member method code with example usage: obj.test_invalid_shape_gpu() without return types